Java에서 IoT 기술을 사용하여 지능형 장치 및 시스템을 구현하는 방법은 무엇입니까?

String broker = "tcp://iot.eclipse.org:1883";
String clientId = "JavaClient";
MemoryPersistence persistence = new MemoryPersistence();

try {
    MqttClient client = new MqttClient(broker, clientId, persistence);
    MqttConnectOptions connOpts = new MqttConnectOptions();
    connOpts.setCleanSession(true);
    client.connect(connOpts);

    String topic = "sensors/temperature";
    int qos = 1;
    client.subscribe(topic, qos);

    MqttMessage message = new MqttMessage();
    message.setPayload("25".getBytes());
    client.publish(topic, message);

    client.disconnect();
} catch (MqttException me) {
    me.printStackTrace();
}

CoapClient client = new CoapClient("coap://iot.eclipse.org/temperature");
CoapResponse response = client.get();
if (response != null) {
    System.out.println(response.getResponseText());
}

String url = "jdbc:mysql://localhost:3306/iot";
String username = "root";
String password = "123456";

Connection conn = null;
Statement stmt = null;
ResultSet rs = null;

try {
    conn = DriverManager.getConnection(url, username, password);
    stmt = conn.createStatement();

    String sql = "INSERT INTO temperature (value, time) VALUES (25, NOW())";
    stmt.executeUpdate(sql);

    sql = "SELECT * FROM temperature";
    rs = stmt.executeQuery(sql);
    while (rs.next()) {
        int value = rs.getInt("value");
        Date time = rs.getDate("time");
        System.out.println("Value: " + value + ", Time: " + time);
    }
} catch (SQLException se) {
    se.printStackTrace();
} finally {
    try {
        if (rs != null) rs.close();
        if (stmt != null) stmt.close();
        if (conn != null) conn.close();
    } catch (SQLException se) {
        se.printStackTrace();
    }
}